Solvent induced synthesis, structure and properties of coordination polymers based on 5-hydroxyisophthalic acid as linker and 1,10-phenanthroline as auxiliary ligand

Mixed-ligand based water-stable Mn(II)-MOF for quick, sensitive, and reusable IFE-PET-RET facilitated detection of formaldehyde and Cr(VI)-oxoanions in real-field samples like food and industrial water: experimental and theoretical insights

We report the luminescence-based detection of Group-1 carcinogen formaldehyde (FA) and Cr(VI)-oxoanions with a mesoporous Mn(II)-MOF (1), featuring a uninodal 4-c net topology and linear 1D square channels forming a polymeric 2D network. The Mn-MOF i.e., [Mn(phen)(hia)(H2O)]∞ was solvothermally constructed using π-conjugated, chelating phenanthroline (phen) and µ3-η2:η1 binding 5-hydroxyisophthalic acid (hia) ligands. The 2D rod-like crystallites of 1 demonstrated excellent phase purity, high thermal and photostability, and robustness under harsh conditions. The SCXRD and XPS studies established the structural framework and elemental composition, while the Hirshfeld surface analysis and NCI-RDG plot confirmed the presence of π-π stacking and weak interactions in 1. We explored the bright-blue emission of 1 for recyclable and fast-responsive (∼70 s) 'turn-off' detection of FA, with a low limit of detection (LOD) of 8.49 µM. Based on this, a 04-input-03-output molecular logic gate was proposed, which can be useful as a molecular switch for future applications. Furthermore, a unique experimental setup using the MOF film demonstrated ∼57% quenching upon exposure to FA vapor (an indoor VOC). Additionally, 1 exemplified itself as an efficient probe towards Cr(VI)-oxyanions, depicting LODs of 79 and 170 ppb, Stern-Volmer constants (KSV) of 16.13 × 104 and 12.73 × 104 M-1, and response times of ∼48 and ∼40 s for CrO42- and Cr2O72-, respectively. DFT calculations and specific wet-chemical investigations elucidated the FA detection to be triggered by photo-induced electron transfer (PET), while the Cr(VI)-sensing involved a combination of PET, the inner-filter effect (IFE), resonance energy transfer (RET), and electrostatic H-bonding interactions. The FA detection was validated using food samples (fish and meat) and wastewater specimens, achieving excellent recovery rates of ∼92-95%. Furthermore, the MOF's efficacy in recognizing the Cr(VI)-species in complex matrices (coal mine wastewater, sewage, and tap water) was investigated to yield high KSV values (3.10-5.17 × 104 and 2.16-7.03 × 104 M-1 for CrO42- and Cr2O72-), which demonstrated the probe's consistency and reliability.

The crystal structure of catena-poly[(1,10-phenanthroline-κ2 N,N′)-(μ3-2-hydroxybenzene-1,3-dicarboxylato-κ5 O,O′:O″,O‴:O‴)cadmium(II)], C20H12CdN2O5

C20H12CdN2O5, monoclinic, P2/c (no. 13), a = 8.6308(6) Å, b = 10.5180(6) Å, c = 18.6325(11) Å, β = 102.210(6)°, V = 1653.17(18) Å3, Z = 4, R gt(F) = 0.0374, wR ref(F 2) = 0.0856, T = 250 K.

The crystal structure of poly[(1,10-phenanthroline-κ2 N,N′)-(μ 4-2-chlorobenzene-1,3-dicarboxylato-κ5 O:O′:O″:O‴) cadmium(II)] monohydrate, C20H13CdClN2O5

C20H13CdClN2O5, monoclinic, P21/n (no. 14), a = 11.4994(9) Å, b = 13.1171(10) Å, c = 13.0233(10) Å, β = 109.126(8)°, V = 1856.0(3) Å3, Z = 4, R gt(F) = 0.0341, wR ref(F 2) = 0.0779, T = 293 K.

Crystal structure of catena-poly[qua-(μ2-2-aminoisophthalat-κ3 O,O′:O′′)(1,10-phenanthroline-κ2 N,N′)manganese(II)] C20H15MnN3O5

C20H15MnN3O5, monoclinic, P21/c (no. 14), a = 10.0223(5) Å, b = 9.3406(5) Å, c = 18.6978(10) Å, β = 99.322(6)°, V = 1727.27(16) Å3, Z = 4, R gt (F) = 0.0376, wR ref (F 2) = 0.0873, T = 250 K.

Coordination Properties of Hydroxyisophthalic Acids: Topological Correlations, Synthesis, Structural Analysis, and Properties of New Complexes

Hydroxyisophthalic acids are valuable polytopic ligands for the design of functional materials based on coordination polymers due to the variety of charges and coordination modes they possess. Herein, we describe the synthesis, thermal stability, nonlinear optical (NLO) and spectroscopic properties of five novel coordination compounds, [K₂ L(H₂ O)₂ ], [MgL(H₂ O)₂ ] ⋅ 3H₂ O, [CaL(H₂ O)₃ ], [SrL(H₂ O)₃ ] ⋅ H₂ O, [BaL(H₂ O)(H₂ O)₅ ], and one salt, (NH₄ )₂ L ⋅ 2H₂ O, with 4,5,6-trihydroxyisophthalic acid (H₂ L), which has not been tested in assembling crystalline coordination networks before. The peculiarities of the structural organization of the compounds were analyzed and compared with those for other hydroxyisophthalates. The coordination properties of hydroxyisophthalic acids were studied from the topological point of view, and a comparative topological analysis of coordination and H-bonded networks was performed. Structural correlations revealed in this study could be useful for the design of hydroxyisophthalate-based coordination networks, including porous metal-organic frameworks, proton conductors, and NLO materials.

Design and synthesis of coordination polymers with chelated units and their application in nanomaterials science

The advances and problems associated with the preparation, properties and structure of coordination polymers with chelated units are presented and assessed.